Protective grating



s. B. HEs's f N Q e /f R P HM 1 `l 6 u 4 s 9 1 a Q 1 oww 4 I 1 1 2 2 1June 30, 1931.

l ,fifi F7 5249/ i 1 .m I, b

Patented June 30, 1931 UNITED STATES PATENT OFFICE SIMON' 1B. HESS, OFNEW YORK, N. Y.

PROTECTIVE GRATING f Application filed April 12, 1923. Serial No.631,738.

` This invention relates generally to burglar A grating formed of woodfor the sake of alarm ysystems of the electrical protective cirlightness in weight and ease in handling is cuit type and particularlyrelates to the improvided to be mounted in place across each provedmeans for holding circuit-completing door and window opening when thebuilding gratings in operative position during the is left unoccupied,as during the night-time 55 hours when the building is unoccupied.hours. The grating includes vertical side The invention consists in theprovision of frame members 14 and intermediate vertical improved meansfor establishing electrical bars 15 crossed by the transverse bars 16 tocontact between contact members carried bv form a grating or grid.

a protective grating and corresponding con- The inner faces of the sideframe members 50 tact members mounted on a door or window 14 of thegrating are provided with contact casing and forming terminals foranormally plates 17 and 18 so positioned as to engage closed circuitprotective system. The inventhe Contact plungers 9 and 10 on the windowy. tion yalso includes means for readily placing frame when the gratingis in position thereon.

the grating in or removing it from operative The Contact plates 17 and18 form terminals 65 position and for holding it securely in place forconductors 19 embedded in the bars 15 when in protecting position. and16 yand strung back and forth and up and In the drawings, in which apreferred down with the bars of the grating to provide form oftheinvention has been selected for a partial circuit terminating at theyopposite 20 illustration, sides of the grating in the contact platescar- 70 Figure 1 is an isometric view of a portion ried by the sideframe pieces 14. It will be of a protective grating andy showing meansseen that this arrangement of the conductors embodying the invention forholding the carried by the grating insures the rupture of grating inplace. the circuit and brings about the actuation of Figure 2 is 'a viewin vertical section of a alarm or other indicating mechanism in the 75portion of the device in Figure 1 showing event that one of the gratingbars is broken circuit closers and grating holding members by anunauthorized entry through the proembodied in the invention. tectedopening.

Figure 3 is a view in horizontal section of In order to hold theprotective grating in the device shown in Figure 2. place ,in guardingrelationk to the window or 80 v Referring to the ydrawings for a moredeother opening, the side frame members 14 of tailed description of theinvention, the verthe grating are provided with openings 19 tical framemember of a window casing yis closed at their outer ends by plates 2Ohavshown at 5. A vertical wood strip 6 is ating openings 21 therein ofan inverted key tached tothe face of the frame member 5 in shapedformation. It will be seen that by 85 any suitable manner and carries anoutstandpassing the enlarged lower ends of the opening'post 7 having anenlarged head 8. The ings 21 in the plates 2O of the grating over strip6 is also supplied with contact plungers the enlarged heads 8 of theposts 7 and then 9 and 10 mounted to protrude through openlowering thegrating to bring the more re- 40 ings in plates 11 .and 12 and tendingto be stricted upper ends of the openings 21 into 90 projectedoutwardlyby the action of springs engagement with the posts 7 to the rear of 13mounted in recesses at the rear of the the heads 8, the gratings aresecurely locked plates 11'and 12 and bearing against the head inposition on the supporting posts 7. The

A of the contact plungers 9 and 10. length of the `posts 7 back of theheads 8 is The plates 11 and 12 and the contact plungsuch that thecontact plates 17 and 18 carried 95 ers 9 and y10-together formterminals of a by the grating engage and depress the conpair ofconductors included in a protective tact plungers 9 and 10 carried bythe strip 6 circuit installation which forms no part of on the windowcasing or frame against the the present invention and is accordingly notpressure of the springs 13. The result of this illustrated. n kis thatthe springs 13 hold the contact plung 10 ers 9 and 10 in close contactWith the contact plates'l'? and 18 and also hold the frame in close andrigid engagement With the under surfaces of the enlarged heads 8 on theposts 7.

The grating is readily placed in protecting position at the close of theday and as readily removed therefrom when thebuilding is again openedand occupied, theseoperations being greatly facilitated by the referredto construction of the pin and slotl attaching means between the'gratingand the frame of the door or Window to be protected. Y

In order to provide a safeguard against the removal of the Wood strips 6andthe pos'- sibility of thereby avoidinga breaking of the circuitthrough the grating lor barrier, circuit closers 22 arefset into theyvertical frame members" 6 as indicated inFigure. 2 of the drawings. Bythis arrangement the spring pressed-contact member 23 of the circuitcloser is normally held out of contact With the` contact 24 byengagement with Athe Window frame 5. Should the frame member 6 be priedfromits position the contact member 23 makes contact with the point-24and closes a short or bridge circuit with relation to the circuitincluded in the grating circuit. The short circuit thus obtainedmanifests itselflin any desired manner at the central oiiice, throughtaking advantage of the dev crease'in'resistancebetween. the bridgecircuitand that includingthe great length of conductor carried by thegrating;

, What is claimed is Y y 'l'.Y Aburglary preventing device comprising agrating, means for removably attaching said grating' to .a Window frame,interlocking pin and slot members yon the frame and grating for holdingthergrating in place, interengageable electrical contacts mounted onsaid frame and said grating, one of said contacts being spring-pressedforurging said pin and slot members into firm engagement With each otherto maintain said gratingin positionon said frame, anelectrical'conductor passing through'the grating and connected'vviththegratingcarried contacts, and a protective ycircuit connected Withvthe framecarried contacts. j 2. A burglary'preventing Vdevicecomprising a grating adapted ,to be removably attached to a Windowframe, interlocking pin and slot members ontheframe and the grat-V ingfor holdingthe grating in place, the pins being provided Withheads,fapair of contacts carried by the grating, a pair of contactscar'- ried vby thek frame, a ypair of springs holding the frame-carriedlcontacts in` engagement vWith the grating-carried Y contacts, saidsprings serving-also to, maintain the. grating 1n firm engagementwiththe heads ofthe pins, anelectrical conductor passing through the gratingand connected with the gratingcarried contacts, and a protective circuiteX- tending through grating and connected With the frame-carriedcontacts.

3. A burglary preventing device comprising a grating means for removablyattaching said grating to a Window frame, means for holding the gratingin place including a member provided With a key-hole slot and alsoincludinga pin member provided With an enlarged head for engagement withsaid slot, interengageable electrical contacts `mounted on said frameand said grating, one

of said contacts being spring-pressed for urgingsaid pin and slotmembers into firm engagement With each other to maintain said grating inposition on said frame, anelectrical kconductor passing through thegrating and contacts vurging` said grating-carried means intointerengaged position with said framecarried means, an electrical.conductorpassing through the grating and connected With-thegrating-carried contacts, and a protective circuit connected with tacts.y

5. Ina burglary preventingvdevice, the combination With a gratingsupport secured to a Window frame, of agrating, means forldetachablysecuring said grating to said-support, Vinterengageableelectrical contacts mounted on said support and saidgrating, andelectrical conductors passing-through the grating and connectedfwith thevgrating-carried contacts, stationary and movable contacts mounted onsaid` support, said movable contact being providedvvith means forholding said-movable contact out of engagement with said 'stationarycontactwhile the support is in position on the frame and also forpermitting said movable Vcontact to engage said stationary contact uponremoval of saidsupport froml said frame, and a protective Vcircuitconnected With said support-carried contacts and with said stationaryand movable Vcontacts. u f f 6. In a burglary preventing Y device, thecombination With a grating support secured to a vvindovs7 frame, of agrating, interen'gaging-means'on said grating'andsupportforremovably-holding the Vgrating on thefsupport,-interengagingelectrical contacts mounted on the frame-carried consaidgrating and said support, one` of said'` contacts 'being spring-pressedfor urgingA said interengaging means into firm engagement gagement withsaid stationary contact While to maintain said grating in position onsaid support, an electrical conductor passing through the grating andconnected with the grating-carried contacts, stationary and movablecontacts mounted on said support, said movable Contact being providedWith means for holding Said movable Contact out of enthe support is inposition on the frame and also for permitting said movable contact toengage said stationary contact upon removal of said support from saidframe, and a protective circuit connected with said supportearriedcontacts and With said stationary and movable contacts.

In testimony whereof I aiX my signature.

SIMON B. I-IESS.

